Writing instrument



FIG. 1 is a perspective view of a writing instrument showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

Portions of the writing instrument shown in broken lines are for illustrative purposes only, and form no part of the claimed design. 

We claim the ornamental design for a writing instrument, as shown and described. 